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Title: Orbital-dependent singlet dimers and orbital-selective Peierls transitions in transition-metal compounds
Authors: Streltsov, S. V.
Khomskii, D. I.
Issue Date: 2014
Publisher: American Physical Society
Citation: Streltsov S. V. Orbital-dependent singlet dimers and orbital-selective Peierls transitions in transition-metal compounds / S. V. Streltsov, D. I. Khomskii. — DOI 10.1103/PhysRevB.89.161112 // Physical Review B - Condensed Matter and Materials Physics. — 2014. — Vol. 89. — Iss. 16. — 161112.
Abstract: We show that in transition-metal compounds containing structural metal dimers there may exist in the presence of different orbitals a special state with partial formation of singlets by electrons on one orbital, while others are effectively decoupled and may give, e.g., long-range magnetic order or stay paramagnetic. A similar situation can be realized in dimers spontaneously formed at structural phase transitions, which can be called the orbital-selective Peierls transition. This can occur in the case of strongly nonuniform hopping integrals for different orbitals and small intra-atomic Hund's rule coupling JH. Yet another consequence of this picture is that for an odd number of electrons per dimer there exists competition between the double-exchange mechanism of ferromagnetism and the formation of a singlet dimer by the electron on one orbital, with the remaining electrons giving a net spin of a dimer. The first case is realized for strong Hund's rule coupling, typical for 3d compounds, whereas the second is more plausible for 4d-5d compounds. We discuss some implications of these phenomena, and consider examples of real systems, in which the orbital-selective phase seems to be realized. © 2014 American Physical Society.
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 84899725937
PURE ID: 375115
ISSN: 10980121
DOI: 10.1103/PhysRevB.89.161112
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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